Rachel learns of her boyfriend's escapades during a massage by Phoebe, Ross and his ex-wife interact because of the impending birth of their son, and Chandler and Joey acquire the foosball table.
This may be one of the most prototypical of all "Friends" episodes, all the characters have a role to play, all are interwoven, and the question of relationships is pivotal. Joey and Chandler play well as "an old married" couple as they fight over a replacement kitchen table, Phoebe becomes involved in Rachel and Ross's complicated "non-relationship" inadvertantly, as Rachel's boyfriend becomes aroused when she gives him a massage, and Ross struggles in an early episode to come to terms with his ex-wife's lesbian relationship and pregnancy.
There's nothing ground-breaking in this episode, its just very typical of the interconnectedness of the storylines of "Friends", and since that was the secret of this series' success, its interesting to see an early season 1 example of this.
Oh, and yeah, Joey and Chandler settle on a foosball table as their new kitchen table, and this table becomes one of the more important "props" for the show over the years. And Monica has many lasagnas to give away, to friends or "foes".